摘要:
An emission device is provided for extracting electrons onto an anode of a visual display. The emission device (10) includes a conductivity limited material (18) positioned between first and second electrodes (14, 16) and having a surface (26). A plurality of catalytic nanoparticles (22) are distributed throughout the conductivity limited material (18), wherein some of the catalytic particles (22) are contiguous to the surface (26). A plurality of nanostructures (24), such as carbon nanotubes, are grown from the catalytic nanoparticles (22) contiguous to the surface (26). A voltage is applied across the conductivity limited material (18) having a plurality of catalytic particles (22) embedded therein, thereby causing the electrons to tunnel between the catalytic particles (22). An anode (28) is spaced apart from the nanostructures (24) for extracting and receiving electrons emitted from the nanostructures (24) when a first potential is applied across the first and second electrodes (14, 16) and a second potential is applied to the anode (28).
摘要:
An emission device is provided for extracting electrons onto an anode of a visual display. The emission device (10) includes a conductivity limited material (18) positioned between first and second electrodes (14, 16) and having a surface (26). A plurality of catalytic nanoparticles (22) are distributed throughout the conductivity limited material (18), wherein some of the catalytic particles (22) are contiguous to the surface (26). A plurality of nanostructures (24), such as carbon nanotubes, are grown from the catalytic nanoparticles (22) contiguous to the surface (26). A voltage is applied across the conductivity limited material (18) having a plurality of catalytic particles (22) embedded therein, thereby causing the electrons to tunnel between the catalytic particles (22). An anode (28) is spaced apart from the nanostructures (24) for extracting and receiving electrons emitted from the nanostructures (24) when a first potential is applied across the first and second electrodes (14, 16) and a second potential is applied to the anode (28).
摘要:
A method or providing uniform emission current from a plurality of electron emitters with a composite current voltage characteristic (620), which include surface states that provide resonant tunneling emission of electrons (260). Field emission device (200) is operated beyond a decrease in the increase of emission current (630) as shown in the composite current voltage characteristic (620) in order to provide uniform emission current.
摘要:
An apparatus is provided for reducing color bleed in a flat panel display. The apparatus comprises an anode (30) with a plurality of phosphors (28) of at least two colors sequentially disposed thereon. A cathode (14) is arranged in parallel opposed position to and separated from the anode (30) and contains a plurality of pads (40) of emitters. Each pad (40) is disposed on the cathode (14) in spaced relationship to and aligned with one of the at least two colors, respectively, wherein electrons from each of the plurality of pads of emitters that drift from its intended phosphor (28) are encouraged to drift toward an adjacent phosphor (28) of the same color.
摘要:
Methods of forming a nano-supported catalyst on a substrate and at least one carbon nanotube on the substrate are comprised of configuring a substrate with an electrode (102), immersing the substrate with the electrode into a solvent containing a first metal salt and a second metal salt (104) and applying a bias voltage to the electrode such that a nano-supported catalyst is at least partly formed with the first metal salt and the second metal salt on the substrate at the electrode (106). In addition, the method of forming at least one carbon nanotube is comprised of conducting a chemical reaction process such as catalytic decomposition, pyrolysis, chemical vapor deposition, or hot filament chemical vapor deposition o grow at least one nanotube on the surface of the nano-supported catalyst (108).
摘要:
A method for fabricating an electron-emissive film (100) includes the steps of providing a powder (124), which has a plurality of carbon nanotubes (104); providing a substrate (102), a surface (103) of which defines a plurality of interstices (107); and dry spraying powder (124) onto surface (103) of substrate (102). The adjustable parameters of the dry spraying step include a separation distance of a spray nozzle (120) from surface (103), a spray angle between a spray (121) and surface (103), and a nozzle pressure at an opening (123) of spray nozzle (120). The separation distance, spray angle, and nozzle pressure are selected to achieve, for example, uniformity of electron-emissive film (100) and adhesion of carbon nanotubes (104) to substrate (102). They can also be selected to achieve a perpendicular orientation of a length-wise axis (105) of each of carbon nanotubes (104) with respect to surface (103) and to achieve the break down of aggregates of carbon nanotubes (104), so that carbon nanotubes (104) are deposited on substrate (102) substantially as individually isolated carbon nanotubes (104).
摘要:
A fabrication process is provided for reducing leakage current in a field emission display having at least one electron emitter (24) electrically coupled to a ballast resistor (16) coupled to a cathode metal (14), wherein at least one defect (28) extends to a gate electrode (20) from a region (22) electrically coupled to the ballast resistor, the method comprising heating (32) to reduce the resistance of the ballast resistor; and applying (34) a voltage between the cathode metal and the gate electrode thereby creating a current through the at least one defect to create an electrical open therein.
摘要:
A method of removing, or otherwise rendering non-conductive, unwanted carbon nanotubes (132) from an electronic device (100) includes exposing at least a portion of the device to light emitted by one or more of light sources (202) that emit light. Those regions of the device that have wanted carbon nanotubes formed thereon can be selectively masked, by various methods, from the emitted light.
摘要:
A field emission device (10) is provided that prevents electrical breakdown. The field emission device (10) comprises an anode (40) distally disposed from a cathode plate that includes an insulating substrate (12) having a portion exposed to the anode (40), and a cathode metal (14) overlying another portion of the insulating substrate (12). A gate electrode (26) overlies an oxide (24) above at least a portion of the cathode metal (14) and optionally above a portion of the substrate. A dielectric layer (18) is positioned between a resistive layer (22) and the cathode metal (14), and substantially all of the exposed substrate, and underlies substantially all of the gate electrode (26) including its edges (34, 46), providing a resistance between the cathode metal (14) and the edges (34, 46).
摘要:
An exemplary system and method for providing a multi-layer klystron-type electron beam device for the generation and amplification of millimeter-wave electromagnetic radiation is disclosed as comprising inter alia: a cathode layer (130); a collector layer (100); an extraction layer (120); a control layer (140); an input cavity (150); an output cavity (170); several ceramic spacer layers (103, 105, 107) dispose intermediately between the cathode (130) and the collector (100); and optionally, several magnetic ceramic layers (160, 165) for beam forming and focusing. After the klystron's layers are assembled, the device may be fired to form a substantially monolithic structure.